APA (7th ed.) Citation

United States. Postmaster General. (1922). Reason for failure to effect delivery must be indorsed on mail returned to sender. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Postmaster General. Reason for Failure to Effect Delivery Must Be Indorsed on Mail Returned to Sender. Washington: [publisher not identified], 1922.

MLA (9th ed.) Citation

United States. Postmaster General. Reason for Failure to Effect Delivery Must Be Indorsed on Mail Returned to Sender. [publisher not identified], 1922.